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DESCRIPTION OF BUSINESS (Details)	1 Months Ended	9 Months Ended
DESCRIPTION OF BUSINESS (Details)	Apr. 30, 2020	Dec. 31, 2020 USD ($)	May 06, 2020 USD ($)	Apr. 01, 2020 USD ($)	Mar. 31, 2020 USD ($) property tenant	Mar. 12, 2020 USD ($)	Dec. 31, 2019 USD ($)
Real estate properties
Number of real estate properties					1,200
Largest tenants \| tenant					3
Cash and cash equivalents \| $					$ 2,848,115,000		$ 106,363,000
Brookdale Senior Living
Real estate properties
Number of real estate properties					122
Number of Brookdale Senior Living properties excluded from count					2
Ardent
Real estate properties
Number of real estate properties					11
Kindred
Real estate properties
Number of real estate properties					32
Unconsolidated Real Estate Entities
Real estate properties
Number of real estate properties					6
Development Projects
Real estate properties
Number of real estate properties					22
Development Projects \| Unconsolidated Real Estate Entities
Real estate properties
Number of real estate properties					4
Triple-Net Leased Properties
Real estate properties
Number of real estate properties					412
Seniors Housing Communities
Real estate properties
Number of real estate properties					405
Revolving Credit Facility \| Unsecured revolving credit facility (1)
Real estate properties
Maximum borrowing capacity \| $					$ 3,000,000,000.0
Additional borrowing, notice to lender \| $						$ 2,750,000,000
Fair value of amount outstanding \| $					$ 2,888,159,000		$ 120,787,000
Subsequent Event
Real estate properties
Cash and cash equivalents \| $			$ 3,200,000,000
Subsequent Event \| 3.50% Senior Notes due 2024
Real estate properties
Senior notes \| $				$ 500,000,000.0
Interest rate				4.75%
Public offering price as percent of par				97.86%
Office Operations \| Subsequent Event
Real estate properties
Operating Lease, Lease Income Collected	96.00%
COVID-19 Impact \| Subsequent Event
Real estate properties
Expected future payments for capital improvements \| $		$ 500,000,000
Reduction in expected future payments for capital improvements \| $			$ 300,000,000